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I was able to send emails using Mailkit SMTP client from multiple accounts. But Microsoft disabled SmtpClientAuthentication for the Tenant.

I checked Send email using Graph API from service account link but not working for my me and getting below exception.

Exception message: "One or more errors occurred. (Code: ErrorAccessDenied Message: Access is denied. Check credentials and try again. ClientRequestId: 36987ffc-de89-43b1-b3d4-2bc753e54a65 )"

Prashant Girase
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  • You followed the documentation how to setup the account/tenant? Especially the [permission](https://learn.microsoft.com/en-us/graph/api/user-sendmail?view=graph-rest-1.0&tabs=csharp#permissions) part when getting "Access is denied" – Ralf Feb 06 '23 at 12:35
  • Yes, I already added "Application = Mail.Send" permissions. – Prashant Girase Feb 06 '23 at 12:47

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